I need to address a few things:
1) Not all fakes are easy to spot - making fakes is a BILLION dollar industry, some do a sloppy job but some do an amazing job.
2) When determining if you have a fake you need to look at the easy to spot indicators I have listed here. If none of these apply to your item that DOES NOT mean that it's real - and not all fakes have the same indicators.
3) Some people will look at the pictures here - see that their Lululemon item for example doesn't have small c in China and think 'Well then it's OK.' Likewise someone will look and say 'Mine doesn't have a size dot in the pocket - must be fake.' Again, not always true. You have to look at each on a case by case basis.
4) These are just some tips but no the be all and end all of fake spotting ;)
If you are just starting to learn about fakes please take the time to read ALL the postings here to learn more =)